3 Configuring the Switch

Oper Path Cost – The contribution of this port to the path cost of paths towards the spanning tree root which include this port.

Oper Link Type – The operational point-to-point status of the LAN segment attached to this interface. This parameter is determined by manual configuration or by auto-detection, as described for Admin Link Type in STA Port Configuration on page 3-126.

Oper Edge Port – This parameter is initialized to the setting for Admin Edge Port in STA Port Configuration on page 3-126(i.e., true or false), but will be set to false if a BPDU is received, indicating that another bridge is attached to this port.

Port Role – Roles are assigned according to whether the port is part of the active topology connecting the bridge to the root bridge (i.e., root port), connecting a LAN through the bridge to the root bridge (i.e., designated port), or is the MSTI regional root (i.e., master port); or is an alternate or backup port that may provide connectivity if other bridges, bridge ports, or LANs fail or are removed. The role is set to disabled (i.e., disabled port) if a port has no role within the spanning tree.

Alternate port receives more useful BPDUs from another bridge and is therefore not selected as the designated

port.R

R: Root Port

A:Alternate Port

D:Designated Port

B:Backup Port

R

AD B

x

Backup port receives more useful BPDUs from the same bridge and is therefore not selected as the designated

port.

RR

ADB

x

Trunk Member – Indicates if a port is a member of a trunk. (STA Port Information only)

These additional parameters are only displayed for the CLI:

Admin status – Shows if this interface is enabled.

External path cost – The path cost for the IST. This parameter is used by the STA to determine the best path between devices. Therefore, lower values should be assigned to ports attached to faster media, and higher values assigned to ports with slower media. (Path cost takes precedence over port priority.)

3-124

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ES4649, ES4625 specifications

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